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HL: Fachverband Halbleiterphysik
HL 75: Poster IIIB
HL 75.9: Poster
Donnerstag, 19. März 2020, 15:00–17:30, P2/3OG
Four-Wave-Mixing Spectroscopy of a Quantum Dot Microcavity System at Large Pulse Areas — •Daniel Groll1, Daniel Wigger1, Jacek Kasprzak2,3, and Tilmann Kuhn1 — 1Institut für Festkörpertheorie, Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster — 2Univ. Grenoble Alpes, F-38000 Grenoble, France — 3CNRS, Institut Néel, "Nanophysique et Semiconducteurs" Group, F-38000 Grenoble, France
We use four-wave-mixing (FWM) spectroscopy to investigate a single quantum dot (QD) strongly coupled to a microcavity, which we model by the usual Jaynes Cummings (JC) Hamiltonian. The corresponding spectrum is called the JC ladder and consists of doublets of dressed states with a splitting that depends nonlinearly on the number of photons present in the cavity. The inevitable coupling between the QD exciton and the phonons of the surrounding medium is treated using a master equation approach. In our study special emphasis is laid on the behavior of the system, when a large number of photons, up to ∼50, is excited inside the cavity. Reaching large pulse areas, where such an amount of photons drives the dynamics, we observe a quasiperiodic behavior of the cavity polarization which gives rise to characteristic features in the measured FWM signals. We find good agreement between experiment and theory for the entire range of considered pulse areas.